National Health and Nutrition Examination Survey, the median copper intake from weaning food for children aged 7 through 12 months is 100 μg/day (n = 45). The average copper concentration in human milk declines over time, and between 7 and 12 months postpartum the concentration is 200 μg/L or less (Table 7-1). Based on an average volume of 0.6 L/day of human milk that is secreted, the copper intake from human milk is 120 μg/day (0.6 × 200). Therefore the total intake of copper from human milk and complementary foods is 220 μg/day (120 + 100). For a 9 kg infant (reference weight 7 through 12 months, Chapter 2), this would be 24 μg/ kg/day (220 μg/kg ÷ 9 kg).

If the AI were extrapolated from the AI for younger infants by using the calculation in chapter 2, the average intake would be 241 μg/day.

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